Josh Berkus <josh@agliodbs.com> writes:
> So ... should I assume my diagnosis is correct? Haven't heard any other
> suggestions.
I don't see any reason to think this is worth worrying about, or worth
spending planner cycles on to produce a cosmetically nicer cost estimate.
One-time filters always apply at the top plan level so they're unlikely
to change any planner choices. Moreover, for any case other than the
not-terribly-interesting constant FALSE case, we're better off assuming
that the filter condition will be true (and so there's nothing to adjust).
regards, tom lane